Carburetor



March 4, I A. FQRGAR 2,233,523

CARBURETOR Filed Oct. 28, 1958 Jrv Patented Mar. 4, 1941 UNITED STATESPATENT OFFICE CARBURETOR I Albert H. Forgar, Los Angeles, Calif.

Application 0ctober'28, 1938, Serial No. 237,504 2Claims. 7 (01. 48-180)My invention relates to a carburetor and has for its principal objects,to generally improve upon' and simplify theconstruction of the existingforms of carburetors and particularly those types of carburetors thatfunction to produce a combustible mixture of air and gaseous fuel,further, to provide a carburetor of the character referred to thatcomprises few parts, capable of-bein'g easily and conveniently adjustedso as'to accurately regulate the flowof gaseous fuel into the column ofair passing through the carburetor and further, to provide a carburetorhaving a Venturi throat or passage through which the gas and air passesso as to produce a thorough mixture thereof. A further object ofmyinvention is, to provide a carburetor having a Venturi passage throughwhich the air is drawn and the carburetor being provided with means forproviding'an annular slot or opening that establishesdirect'communication between a chamber that is supplied with gaseousfuel and the Venturi passage, so that the column of air as it travelspast-the annular slot or openingthat admits the gaseous fuel will meetand combine with said gaseous fuel throughout a circular zoneimmediately prior to the point where the air and gaseous fuel mixedtherewith passes into that portion of the Venturi that graduallyincreases in diameter.

A further object of my invention is, to provide a carburetor comprisingthree main parts, two of which have abutting ends that are connected bythe third part and the latter being provided with an annular chamberthat receives gaseous fuel from a suitable source of supply and one ofthe parts of the carburetor being ad.- justably connected to theintermediate member,

. so as to enable the annular slot through which the gaseous fuel passesinto the Venturi throat or passage way to be very accurately regulatedin width and, consequently enabling the carburetor to be adjusted so asto operate at maximum emciency and in accordance with the .gaseous fuelthat is used in producing the combustible mixture.

A further object of my invention is, to provide a device of thecharacter referred to that may be utilized as a fuel inlet and mixingdevice.

With the foregoing and other objects in view, my invention consists incertain novel features of construction and arrangement of parts thatwill be hereinafter more fully described and claimed "and illustrated inthe accompanying drawing in which:

Fig. 1 is a top plan view of a carburetor constructed in accordancewithmy invention.

Fig. 2 is a vertical cross section taken on the 5 line 2-2 'of Fig. 1.

Fig. 3 is a side elevational view taken looking in the directionindicated by the arrow 3, Fig. 1.

Fig. 4 is a horizontal section taken on the line 4-4 of Fig. 2. 10

Referring by numerals to the accompanying drawing which illustrates apreferred embodiment of my invention, In designates a short tubularbody, one end of which is provided with a flange l l or otherwiseconstructed so that it may be conveniently applied to an internalcombustion engine or other structure with which the carburetor isassociated. The opposite end of member I0 is constructed so that theopening therethrough gradually increases in diameter to- .20 ward theintermediate portion of said member, thus forming a Venturi throat l2 ofgraduallyincreasing diameter.

Mounted for operation within member [2 just beyond the large 'end of thethroat I2 is a conventional butterfly valve l3 which when actuatedcontrols the new of combustible mixture through the carburetor.

The end of member l0 opposite the end pro. vided with the flange H isprovided with an 'ex ternal thread l4 that receives the internallythreaded end of the intermediate or connecting member [5 of thecarburetor. This member I5 is in the form of a ring or collar having aninternally arranged annular chamber I6 for the gaseous fuel and thelatter being delivered to said chamber by a suitable pipe or duct IT.

This pipe or duct leads from a suitable source of gaseous fuel supplyand a conventional pressure regulator and a valve or valves not shown 40may be associated with the tube 11, in order to control the flow ofgaseous fuel therethrough.

Theend of connecting member I5 opposite the end that is connected tomember ['0 is :internally threaded for the reception of the third memberl8 of the carburetor, said member being shaped somewhat similar .to afunnel and having an inlet throat I9 that gradually decreases indiameter from its outer end to its inner end.

The threaded connection between members l5 and I8 is such that member l8may be readily rotated so as to be screwed into or out of member l5 and,to retain the member I8 in its adjusted position the free end of aspring 28 that I slightly less than the diameter of the adjacent end ofthroat I2 in member I0. As a result of this construction, when member I8is adjusted so as to position its inner end apart from the adjacent endof. member I an annular slot 23 is formed between'the annular fueldistribution chamber l6 and thaVenturi passage through the carburetor.

The inner circumference of this slot com municates with the Venturithroat just beyond the inner end of the throat IS in member I8 and withthe slightly larger end of the throat I2 in member I0, 50 that thecolumn of air passing through throat I9 will receive at all pointsthroughout its circumference gas as it discharges from the innercircumference of slot 23 and, as a result a more uniform mixture of thegas and air is brought about, This effect is enhanced by reason of thefact that the smallest end of throat I2 is slightly larger in diameterthan the small end of throat I9 in the air inlet member I8.

In the use of my improved carburetor, air inlet member I8 may be screwedinto or out of member I so as to vary the width of slot 23 that admitsgaseous fuel to the column of air flowing through the Venturi passagewayand, thus the degree of carburation may be very accurately regulated.

After being set or adjusted, member I8 may be secured in such adjustedposition by the engagement of the free end of spring 20 in one of thenotches 22.

Thus, it willbe seen that I have provided a carburetor that includes apair of tubular members with the ducts or openings through said memberscontoured so as to form a venturi and said members being adjustablyconnected so that one member may be moved toward or away from the othermember to provide a variable annular slot for the admission of gaseousfuel to the column of air passing through the carburetor and, saidgaseous fuel inlet slot being located at the point in the Venturipassageway where there is the strongest suction so that the device willfunction advantageously even though the gaseous fuel is not underpressure above that of the atmosphere.

An especially desirable feature of my invention is, the provision of anadjustable annular slot that controls the admission of gaseous fuel tothe column of air passing through the carburetor and the arrangementwhereby the admitted gaseous fuel is delivered to the column of air atall points throughout its circumference, together with the arrangementwhereby the air and the gas admitted thereto are permitted to expandslightly at the point where the gas is admitted and further expansionand consequent mixture of the gas and air taking place as it passesthrough that portion of the venturi that gradually increases in diameterbeyond the admission point of the gaseous fuel. I

In some instances, it may be found desirable and advantageous to formthe ring .or collar I5 integral with the body member III, with member I8arranged to screw into "the upper portion of said ring or, said ring maybe formed integral with member I8 and screw on to the upper end of bodymember III. The device thus constructed in two main parts would functionthe same as the construction herein illustrated and described or wherethe device comprises three parts.

Thus,,it will be seen that I have provided a carburetor that isrelatively simple in construction, strong and durable, capable of beingreadily adjusted so as to accurately control the degree of carburationand which carburetor without change may beadvantageously employed as afuel mixer and inlet forvarious purposes. It will be understood thatminor changes in the size, form and construction of the-various parts ofmy improved carburetor, may be made and substituted for those hereinshown and described, without departing fromthe spirit of my invention,the scope of which is set forth in the appended claims.

I claim as my invention: j,

l. A carburetor comprising a pair oftu ular members arranged end to end,a member connecting said tubular members, which member is provided withan annular chamber that surrounds the adjacent ends of said tubularmembers, means for supplyinggaseous fuel to said chamber, the openingthrough one of saidmembers being contoured to form a venturi, the othertubular member being screw seated'in the connecting member so as to beadjusted toward and away from the-other tubular memberso as to providean adjustableannular slot that establishes communication between saidannular chamber and theventuri passage, said adjustable tubular memberbeing provided with a throat that tapers toward its inner end and theinner end of whichthroat is smaller in diameter than the small end ofthe venturi in the other tubular member and a throttle valve arrangedfor operation within the tubular member having'the venturi. v

2. A carburetor as set forth in claim 1, with a flange formed on theouter end of the. tubular member having the tapered throat, said flangebeing provided with a plurality of notches and a resilient member havingone end fixed to the member that connects the two tubular members withthe free end of said resilient memberengaging said notched flange.

ALBERT H. FORGAR.

